Your Source for DIY Pedal PCBs and NostalgiTone! › GuitarPCB Forum › Show Off Your Build › Blues Buster w/rotary switch mod
- This topic has 9 replies, 7 voices, and was last updated 4 years ago by
Oscar Lamas.
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March 5, 2022 at 6:33 pm #23530
Anonymous
Guest12 position rotary switch selects clipping diodes, D6 pads used as send/return for hard clipping, A/B pads for soft clipping. 4PDT switch selects between hard and soft clipping, for a total of 24 potential clipping styles. Right now I’ve got position 11 open, I will either add one more set of diodes or wire them to an external connector. Positions 12 and 1 represent the original clipping options.
Is it necessary? No. Are they all level matched? No. Did I have a rotary switch laying around, and a bin of diodes, yes.




Forward voltages as measured by my Fluke 37.
The drive control seems a little more subtle than I was expecting throughout the sweep, but maybe that’s normal.
March 5, 2022 at 6:51 pm #23532Anonymous
GuestCan you comment on the differences you hear from the settings? Are some too close to notice? Are some very different?
March 6, 2022 at 3:00 pm #23542Anonymous
GuestYes, for sure the silicon diode setups with similar forward voltage sound pretty similar. But you can definitely hear subtle differences as you switch around the dial. I haven’t played it a ton so far as I’ve just finished it, and the differences are easier to hear with my larger 2×12 setup than with my practice amp. As expected you lose a lot of signal with the heaviest clipping options. The #1 clipping option doesn’t look like it does much in the images below, but you can hear it when playing.


All waveforms below are with tone and drive dimed out:

quick video of my setup:
March 6, 2022 at 4:22 pm #23543
ChuckParticipantWoof! I mean that in a really good way.
Chuck
March 6, 2022 at 4:27 pm #23545
CybercowParticipantNick – Excellent! With that many clipping options on a single rotary, the only thing I might have done differently is to have arranged the clipping elements so they were louder-ascending order in accordance with the rotary switch – #1 (being the lowest volume & most clipping) to #12 (with the least clipping). Basically, using the measured average Fvd of each clipping combos to set the order on the switch.
All-in-all, quite the varied clipping selection options. Thanks for sharing. Bravo!
March 6, 2022 at 4:49 pm #23546Anonymous
GuestThanks, and totally agree on that logic, to lessen the tweaks to the volume adjustments. I had to make some positioning compromises due to real estate around the rotary, but even so probably could have arranged them with more intent.
March 6, 2022 at 5:13 pm #23548
Big OParticipantI was going to do something similar with my Clean Dirt pedal, which has 4 symmetrical and 4 asymmetrical clipping options. I had planned to use two Rototone’s to mix and match 4 clipping diode pair combinations with 4 single clipping diode choices, but just decided use a switch to switch a single diode with each different pair for a total of 8 combinations instead of the originally planned 16. I just felt it was too much decision making. I have gone back to simpler is better for me, but 24 clipping choices in one pedal is quite impressive!
March 6, 2022 at 5:15 pm #23549Anonymous
GuestMany thanks. That will be helpful!
March 6, 2022 at 9:04 pm #23554
BarryKeymasterA visual representation of why I like LEDS or an LED in the mix.
That is excellent and thank you for taking the time to post.
May 10, 2022 at 7:25 pm #24558
Oscar LamasParticipantGreat post. Thanks for sharing.
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